Removed 5V to 3.3V table conversion.
The conversion is leading to an erronous temperature reading, as for instance 1°C reading at room temperature.
The 5V table provided in _ADC-counts_ is valid as long as the ADC reference voltage and the INA826 supply voltage are identical.
The ADC is providing counts in relation to his reference voltage and the INA826 does the very same in the analog domain.
Validated with additional PT100 measurement for 100°C and room temperature.
Note, that the quantization error of the table in combination with rounding of the temperature reading might lead to a few degrees (seen up to 3°C) of error around the center between datapoints, e.g. 25°C, 35°C, etc.

added temp_sensor_0 21 for integration test

changed back for PR

updated description for temperature probe 20 and 21

reverted back to original code and added additional comment on intended usecase for this probe (5V INA826 supply, 3v3 ADC ref on mainboard)